Here's why:
* Energy Production: Cellular respiration is the process that breaks down glucose (sugar) to produce ATP, the primary energy currency of cells. All living cells need energy to carry out essential functions like growth, repair, movement, and maintaining their internal environment.
* Continuous Need: Unlike plants, which can generate some energy through photosynthesis, animal cells rely entirely on cellular respiration for their energy needs. This process happens continuously to support the cell's constant energy demands.
Factors Affecting Respiration Rate:
While respiration is ongoing, the rate can fluctuate based on factors like:
* Activity Level: More active cells, like muscle cells during exercise, require more energy and thus have a higher respiration rate.
* Nutrient Availability: The amount of glucose available influences the rate of respiration.
* Oxygen Levels: Cellular respiration requires oxygen. Low oxygen levels can slow down respiration.
In Summary: Animal cells perform cellular respiration constantly to maintain life. The rate of respiration adjusts based on the cell's energy needs and environmental factors.
